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i#5651: Switch DR's suspend signal to SIGILL with sigqueueinfo

Merged Derek Bruening requested to merge i5651-sigpwr into master

Switches the signal DR uses to suspend threads from SIGSTKFLT, which is not supported in gdb, to SIGPWR. SIGPWR is similarly obscure and never used on Linux, but is supported by gdb, and does not cause QEMU to fail.

Fixes #5651 (closed)